01
Read the diagnostic
Compare normal and disrupted estimated journey times.
Free transit game · Tokyo Metro and Toei SubwayPlay Signal Lost
Signal Lost Tokyo
Identify a disrupted segment on the Tokyo Metro and Toei Subway from progressive journey diagnostics.
How to play Signal Lost
02
Cross-check journeys
Unlock up to two more diagnostics when needed.
03
Find the failure
Accuse the only segment matching every clue.